The Austrian-Bosnian coach, who guided Schalke back into the Bundesliga last season and saw his contract automatically extend to 2028 as a result, used an interview with Bild to shut down any talk of a move to Borussia Dortmund.
"Nobody needs to come knocking. I know it's a topic for the media, but Schalke 04 is my dream club," Muslić said. He then went further, making a direct promise to supporters of the Königsblauen.
"I would never go to Borussia Dortmund," he said. "Out of respect for Schalke 04 and for our fans, I would never cross that red line."
Muslić, 43, does have a release clause in his contract, though he currently shows no sign of wanting to use it. Asked about ambitions beyond Gelsenkirchen, he named a very different destination as his ultimate dream move, one that notably did not include Bayern Munich.
"Then rather Atletico Madrid. Now I've named my dream club," Muslić said. "I hope for a friendly match."
The Bosnian-born coach, who arrived in Austria as a child amid the Bosnian war, also outlined long-term ambitions to manage at international level once his club career winds down, ideally with the country of his birth.
"One day - God willing. Maybe in 15 or 20 years, in Bosnia-Herzegovina," he said.
Schalke's sporting boss Frank Baumann has previously said the club would welcome working with Muslić well beyond his current deal, a sentiment the coach's comments this week appear to reciprocate.
Muslić took charge at Schalke in 2025, arriving from Plymouth Argyle after the League One club reluctantly granted him permission to speak with the Bundesliga side, and led them out of the second tier and back into Germany's top flight for the first time in years, cementing his standing among supporters in the process.
Despite not having grown up in Gelsenkirchen himself, Muslić has repeatedly shown an understanding of how deeply the rivalry with Dortmund runs among Schalke's fanbase, and his latest comments appear designed to reassure supporters who have grown wary of coaches leaving for bigger jobs before finishing what they started.
With promotion secured and a fresh contract already in place, the club will now be hoping his stated commitment translates into sustained results as Schalke prepare for their first Bundesliga campaign in years.